Air-compressor.



J. R. KINNEY.

AIR COMPRESSOR.

APPLICATION FILED JUNE 5, 1912.

1,061,181 Patented May 6, 1913.

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J. R. KINNEY.

AIR COMPRESSOR.

APPLICATION FILED JUNE 5, 1012.

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an outlet for the air from the piston cham- UNITEDSTATES PATENT OFFICE.

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AIR-COMPRESSOR,

Specification 0t Lettrs Patent.

V Application filed June 5, 1912.' Serial No. 701,918.

Patented May 6, 1913.

To all 'ul hOm it may concern:

Be it known that I, JUS'I'US R. KINNEY. a citizen of the United States of America, and a resident of Dorchester, in the'county of Suffolk and State of, Massachusetts, have invented certain new and useful Improvements in Air-Compressors, of which the following is a specification. This'invention relates to air compressors and particularly devices of this class in which a rotary piston is mounted in a cylindrical piston chamber and is provided with a radial blade adapted to reciprocate in a slotted oscillating member, said blade having a. depression in one face thereof serving as ber.

The invention further consists in providing a communicating passage between the outlet of one piston chamber to the inlet of the other pistonchamber, whereby the air compressed in the first mentioned piston chamber is partially compressed and the compression is completed in the second chamber.

The invention further consists in so positioning the pistons in the two chambers that the second piston will close the outlet during the compression in the first chamber.

The invention consists further in certain novel features of construction and arrangement of parts which will be readily u nderstood by reference to the description of the,

drawings and to the claims hereinafter given.

Of the drawings: Figure '1 represents a vertical section of an air compressor embodying the features of the present invention, the cutting plane being on line 11 on Fig. 4. Fig. 2 represents a similar section looking from the opposite side, the cutting plane being on line 2-2 on Fig. 4. Fig. 3 represents a vertical transverse section of the same, the cutting plane being on line 3-3 on Fig. 1, and Fig. 4 represents a horizontal section of the same, the cutting plane being on line 4-4 on Fig. 2.-

Similar characters designate like parts throughout the several figures of the drawmgs.

In the drawings, 10 represents a casing provided with two alined cylindrical piston chambers 11,113 separated by a partition wall 12. Secured to the opposite faces of the casing member 10 by bolts 13 are the end .plates 14 and 14*. The end plate 14 is prorevoluble shaft 16 centrally dis osed in the piston chambers 11 and 11". T 'e revoluble shaft 16 extends through a bearing 17 formed in the end plate 14*, and is driven from any suitable source of power. Within each of the chambers 11 and 11* is positioned an eccentric 18 keyed to the shaft 16 and revoluble therewith, these eccentrics being 0 pcsitely disposed as indicated in Fig. 3 o the drawings. Surrounding each of the eccentrics 18 is an annular piston member 19, one portion of the peripher of which is adapted to contact with the cy indrical wall of the chamber 11 during the rotation of the revoluble shaft 16. Formed upon or secured to tending through the casing member 10 from end to end, this compartment being connected by means of the passage 25 with the second piston chamber 11. The outlet 23 from the compartment 11 communicates with the chamber 26 extending from end to end of the casin member 10, this chamber 26 having a discharge passage 27 therefrom communicating with the discharge pipe 28. The chamber 11 has an air inlet compartment 29 communicating therewith, this comartment communicating through an opening 30 with the inlet passage 31, the outer end of said passage 31 having extending therein and threaded thereto an inlet pipe 32. In the passage 31 is mounted a valve 33 normally held to its seat by means of a spring 34, thereby preventing the admission of air to the inlet compartment 29 when the device is not in operation. The valve 33 is provided with a valve stem 35 having a bearing in the closing plug 36 threaded to the casing 10, all as indicated in Fig. 1 of the drawlngs. Each of the blades 20 has a depression 37 in one face, extending from the outer end of said blade to a point 38 somewhat removed from the periphery of the piston member 19. During the revolution of the shaft 16 the operation of the annular pistons upon the eccentrics 18 secured to said shaft will impart a reciprocating movement to the blades 20 through the slots 21 in the oscillating members 22 while at the same time these members 22 will oscillate about their axes. During the greater part of this movement the depressions 37 will communicate with the iston chambers 11 and ermit the air in a vance of the piston 'mem r 19 to be partially compressed and forced through the depressions 37 into theoutlet passages 23 and 23". The piston 19 in the chamber l1 is so positioned relative to the piston 19 in the chamber 11 that, during the rotation and compression of the latter, itwill cut off the'outlet from said chamber 11. It is obvious that owing to the position of the shoulder 38 of the depression 37 relative to the periphery of the piston 19, during a port-ion of the revolution of the latter, the discharge from its piston chamber will be out 01f, thereby permitting the compression of the air in advance of said piston until, in the movement ofthe blade 20 the depression 37 again communicates with said piston chamber, thereby permitting the outlet of the air under compression. This air under compression discharged from the first piston chamber 11 will pass through the compartment25 into the OthQI PIStOII chamber 11?, and be further compressed and then discharged through the passage 26 and outlet pipe 28.

In order to prevent any of the air in either piston chamber from bein pocketed during the operation of the devlce after the discharge from the chamber has been cut off b the complete inclosure of the depression 3 in the blade 20 within the slot of the oscillating members 22 a portion of the cylindrical wall of each piston chamber is cut away as indicated at 39 in Figs. 1 and 2 of the drawings, this out away portion extending to a point where the periphery of the piston 19 would contact wlth the cylindrical wall of the piston member 11 or 11* at the time the shoulder 38 of said depression 37 enters the slot 21 in one of the oscillating members 22. This feature has been found to be of considerable importance in the operation of the device, as it prevents any portion of the air in the piston chambers being pocketed, inasmuch as it permits the air in advance of the piston 19 when it cannot be discharged through the depression 37 to pass to the rear of the piston 19 during its rotation.

During the operation of the device when the annular member 19 of the piston chamber 11 is in the position shown in Fig. 2 it will be compressing but the annular member in the other piston chamber 11 will then be in the .positlon shown in Fig. 1 with the blade 20 so far inserted in the slot of the oscillating member 22 that outlet from said chamber 11 will be entirely out off until such time as in the rotation of said member 19 the passage 37 is uncovered. when discharge of the compressed air in the chamber 11 will bepermitted. Moreover, when the two members 19 are in the positions above will cover the mouth of the inlet 25" thereto and prevent admission ofthe aircompressed in the chamber 11 until in the rotation of the piston in the chamber 11" thispassage is unmentioned the member 19 in the chamber 11f covered. It is obvious, therefore, that While the piston in the chamber 11 is compressing,

the discharge from the other chamber will be prevented by the position of the blade 20 in its oscillating member 22 during a portion of the cycle of said piston and admission to the second piston chamber 11 will be prevented by the closure of the admission passage 25 thereto. When this passage 25* is uncovered and the movement of the blade 20 of the second piston opens the outlet from the chamber 11 the blade 20 of the first piston reaches a point where the discharge passage 3.7 thereon is covered and further discharge from the chamber 11 is prevented for a portion of the cycle of said piston.

By such aconstruction the rotation of -the piston in the chamber 11 effects a compression not only in said chamber but also in the chamber 11 so that. when the air is finally discharged from the chamber 11 it is under a high degree of compression.

With a device of this kind air can be compressed to an almost unlimited extent without apparently any diminution of speed of the revoluble shaft 16.

The valve 33 is normally closed and prevents the escape of any of the air within as the shaft 16 revolves the vacuum created thereby within the chambers and compartments will cause the valve 33 to be raised against the tension of the spring 34: and admit an additional supply of air thereto.v It is obvious that the tension of the spring 34 must be such as to permit the valve 33 to be raised when a vacuum is created within the compartments and chambers of the casing 10.

the various chambers and compartments, but

It is believed that the operation and many advantages of the invention will be fully understoodfrom the foregoing.

Having thus described my invention, I claim:

1. In a device of the vclass described, the combination of a casing having two piston chambers therein and a smaller cylindrical chamber communicating therewith, said casing being provided with a passage from the outlet of one piston chamber to the inlet of the other; two slotted oscillating-members positioned in said smaller chamber; an eccentric in each piston chamber said eccentrics being oppositely disposed; and an annular member on each piston provided with a radial blade rigidly secured thereto each blade having an outlet passage therein extending outwardly from a point removed from the periphery of said annular member whereby the out-let from each piston chamber mav'be temporarily out off during a portion of the cycle of said piston.

2. In a device of the class described, the combination of a casing having two piston chambers therein and a smaller cylindrical chamber communicating therewith, said casing being provided with a passage from the outlet of one piston chamber to the inlet of the other; two slotted oscillating members positioned in said smaller chamber; an cccentric in each piston chamber, said eccentrics being oppositely disposed; and an annular member on each piston provided with a radial blade rigidly secured thereto, each blade having an outlet passage therein, the annular member of the second piston chamber being adapted to close the inlet thereto while the piston in the first piston chamber is compressing.

3. In a device of the class described, the combination of a casing having two piston chambers therein, the outlet from one com- .municating with the inlet of the other; and

rotar eccentric pistons in said chambers so positioned relative to each other that one will cut off the inlet to the second piston chamber while the piston in the first chamber is compressing.

4. In a device of the class described, the combination of a casing having formed therein two piston chambers, an outlet compartment communicating with one chamber, an inlet passage communicating with the other chamber, and a connecting passage between the inlet to the first mentioned chamber and the outlet from the other chamber; rotary eccentric pistons in said chambers each provided with a radial blade having a groove in one face thereof adapted to permit the passage of air from said chambers during a portion of the cycle of said pistons and cut ofi the outlet for said air during the remainder of said cycle; and a check valve in said inlet passage.

5. In a device of the class described, the combination with a casing having two alined piston chambers separated by a division wall; an inlet passage to one of said chambers; a check valve in said passage; a revoluble shaft extending through both chambers; an eccentric keyed to said shaft in each chamber, said eccentrics being oppositely disposed; an annular piston mounted upon said eccentric provided with a radial blade having a groove in one face extending from its outer end to a point slightly removed from the periphery of said plston; a slotted oscillating member for each blade through the slot of which said blade extends; a passage from the outlet of one chamber communicating with the other chamber; a compartment communicating with the outlet of the other chamber; and a discharge passage from said compartment.

6. In a device of the class described, the combination with a casing having a piston chamber and inlet and outlet passages communicating therewith; a check valve in said inlet passage; an oscillating slotted member in said outlet passage; a rotary eccentric piston in said piston chamber providcd with a radial blade having a groove in one face extending from its outer end to a point slightly removed from the periphery of said piston.

7. In a device of the class described, the combination with a casing having a piston chamber and inlet and outlet passages communicating therewith; a check valve in said inlet passage; an oscillating slotted member in sald outlet passage; a rotary eccentric piston in said piston chamber provided with a radial blade having a groove in one face extending from its miter end to a point removed from the periphery of said piston, the wall of said piston chamber being cut away from said blade to a point where the portion of the periphery of said piston farthest removed from its axis of rotation would contact with said wall when the inner end of said blade groove enters the slot in said oscillating member.

8. In a device of the class described, the combination of a casing having formed therein two piston chambers, an outlet coinpartment communicating with one chamber, an inlet passage communicating with the other chamber, and a connecting passage between the inlet to the first mentioned chamber and the outlet from the other chamber; oppositely disposed eccentric pistons in said chambers each provided with a radial blade having a groove in one face thereof adapted to permit the passage of air from said chambers duringa portion of'the cycle of said pistons and cut off the outlet for said air during the remainder of said cycle; and a check valve in said inlet passage.

Signed by me at 4 Post Otfice Sq., Boston, Mass, this 29th day of May, 1912.

J USTUS R. KINNEY.

Witnesses:

WALTER E. LOMBARD, NATHaN C. LOMBARD. 

